Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 23,097	$ 22,356	$ 22,867	$ 38,133
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net tax of $0	49,896	10,079	(3,743)	(1,967)
Interest rate hedge adjustments, net of tax benefit of ($430), ($115), ($430), and ($227), respectively	(1,256)	563	(1,256)	1,113
Defined benefit pension plans, net of tax expense of $633, $798, $1,693, and $1,569, respectively	84	1,428	2,847	2,882
Total other comprehensive income (loss), net of tax	48,724	12,070	(2,152)	2,028
Comprehensive income	$ 71,821	$ 34,426	$ 20,715	$ 40,161